If you are interested in learning App Inventor, below is a link to an introductory book, by Ralph Roberts with me as Technical Editor on that book. It contains many great examples to get you started quickly. It also includes references to AppToMarket tool for converting your AI apps to Android Market compatible apps. Check out the eBook here:
http://www.packtpub.com/google-inventor-for-powerful-android-apps/book#in_detail
